In the study CCNA related courses NAT Network Address Translation content，When the practice often requires no out a dynamic NAT or PAT address pool
Cisco IOS NAT table as long as the provision of translation entries have included the address of the address pool，You will be able to modify or delete the address pool。
at this time，You enter
(config)# no ip nat pool pool_name
It will give the corresponding tips：
%Pool pool_name in use, cannot destroy
In General，You need to execute the following command：
#clear ip nat translation *
but，Does not seem at all so that every IOS，Some versions of IOS will still prompt can not be deleted。
at this time，You need to remove the ACL Binding,E.g：
(config)#no ip nat inside source list 1 pool pool_name
Then you can delete the address pool。
Original article written by LogStudio：R0uter's Blog » About Cisco router% Pool globalnet in use, can not destroy solutions
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